Automatic firearm with toggle-joint.



' AUTOMATIC Hanan vfl'riuoecu 10m. APPLICATION FILED FEB. 2. 19H.

1 ,'160 ,831 Patented Nov. 16, 191 5.

2 SHEETSSHEET lf To all whom it may concern UNITED STATES. PATENT OFFICE.

' nvoo Bononnnn'r, or cnamio'rmnnuno, GERMANY.

Y AUTOEATIC mnnmu wnn rodeLE-Jom'r.

Be it known that I, HUGO YBORGHARDT, Clt izen of the United States ofnAmerica, residing at No. 31 Kantstrasse, Charlottenburg,

near Berlin, Germany, have invented certain new and useful Improiements in Automatic jFirearms with Toggle-Joints, of which the following ,is a specification. I

' It is known in connection with automatic fire-arms to lock the trigger, when the breech is open, by a member controlled by the breech bolt. The action of the'locking member is thus directly dependent on the posi-- tion of the breech bolt and is therefore not exact, because a comparatively long movement of the breech bolt is necessary in order to engage or disengage'the detent.

This invention relates to a detent for a utomatic fire-arms with toggle joint, wherein the said drawbacks'are obviated by rendering the action of the detent. not dependent directly on'the movement of the breech bolt but on the movement of the toggle joint. This toggle joint, and especially its central point, covers, during the first opening movement of the breech, a distance which isa multiple of that ofthe breech bolt. It can therefore be attained with the greatest 'degree of accuracy that the trigger is released only when the breech is actually completely closed.

The invention is shown by way of example in the accompanying drawing.

Figure 1 is a broken side elevation showing the locking device with closed breech i. e.

inenerative and Fig. 2 is a cross-section on line A-A-of Fig. 1. Fig. 3 is a side view of the engaged detent with breech not completely closed. Fig. 4 is a longitudinal view partly in section showing the trigger mechanism. Fig. 5 is a horizontal sectional view of a part of the mechanism shown in Fig. 4.

In the constructional form of the invention illustrated in the drawings, the trigger locking member cooperates with a rod 1) connecting the sear s to the trigger i and slidably mounted in the breech casing 0..

The scar 8 comprises two parts 8 8 one of which, 8 is pivoted'at s to the breech casing c and cooperates with the connecting rod 1), while the other part, 8 engages the firing pin 7) and is rotatably and slidably mounted in the part 8 In the cocked position (see Fig. 5) the sear member s is held by the pressure 'of the spring p in the foremost position. When Specification of letters ratent.

spring 7) of the firing pin.

Patented Nov. 16,1915. Application flied February 2, 1914. Serial No. 816,045. v

the trigger i is pulled for firing the connecting rod 7) is shifted in the forward direction and rocks the sear member 3 which by means of its fore end underlying the sear, member s rocks this latter so that it refe'ases' rocked by the spring a into the engaging position.

When the firing pin returns with they-m breech mechanism vinto the forward-posin tion, the firing pin is again caught by the sear member s and this latterjis represmd into its initial position (see Fig. 5) by the The trigger locking member consists of a safety slide a, which is slidably mounted ver-.

tically to the longitudinal axis of the fire-' arm in the breech casing a. The lower, rec

tangularly bent down end of the safety slide engages under the connecting rod 6, which isprovided behind the safety slide with an abutment b and in front of the safety slide with an arm I) engaging under'the latte The upper end of the safety "slide been, when the breech is closed, on the inner surface of the annular shoulder e of the middle joint of the toggle member 7, g. A spring 61 presses upon the lower end of the safety slide a.

When the breech is not completely closed (Fig. 3) ,the safety slide a is kept in a raised position by means of the spring d, its lower arm being situated in front of the abutment Y b of the connecting rod 5. The sear cannot therefore be moved forward i. e. the firing pin cannot be released. \Vhen the breech is completely closed (Fig. 1 and the safety slide a will be depressed by the shoulder e I against the action of the spring at so that the lower arm of the safety slide is out of reach of the abutment b of the connecting rod 7). The trigger mechanism is now released. During the downward movement of the safety slide a, the arm 6 of the connect ing rod serves as an abutment for limiting this movement. Only a very small movement of the safety slide corresponding to the height of the abutment b 'is necessary for the release of the connecting rod. This movement is a multiple of that movement or distance, which is covered by the breech 2- 1,160,831 I i. j

boltin the same time. The dtent can thus locking means for the trigger mechanism only be released at the last moment of the adapted to be moved by thieftoggle joint in closing movement '1. (a the trigger will only a direction vertical or almost vertical to the be released when the breech is completely direction of movement of the breech block 5 closed. to unlock the trigger mechanism. 30 i It will be clear that various changes can r. In an automatic firearm having a togbe made in the details of the construction gle joint breech mecl'ianisnngi slide guided and arrangement and that theinvention is in the breech casing and a spring normally not limited to the j'irerise form and combinzu holding saidslide in locking engagement 10 tion of the trigger lock and trigger n1echawith. the trigger mechanism. said slide being 3 nism shown and described herein. shifted by the toggle joint to rel'ease the trigclaim ger meelninism at the instantthat the breech 1. In an antoi'natic firearm the combinais closed. tion ol a toggle joint breech mechanisn'i, and 5. An automatic firearm comprising a togi5 means normally locking the trigger mechagle joint breech meehanism,a trigger'mech- 4e nism and actuated b the toggle joint to reanism. and means under control of the toglease the trigger mecl'ianism at the instant gle joint to lock the trigger mechanism when that thebreech is closed. the breech is open.

.4'. In an automatic lirearm the combina- In testimony whereof I have al'lixed my m tion of a toggle joint breech mechanisn'i. and; signature in presenceot' two witnesses. means under control oi thecentral 'oint o i i H the toggle members for locking the trigger HUGO BORCHARDIT mechanism when the breech is open. 'itnesses:

2-). In an automatic firearm the combina- R 11T MH'IIAL KY, x

2-? tion of a toggle joint breech mechanism. and l-Vonmmim'HAcvr. 

